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arxiv: 1409.6829 · v2 · pith:FH2ISP2Inew · submitted 2014-09-24 · ✦ hep-ex · nucl-ex· physics.ins-det

Search for Majoron-emitting modes of double-beta decay of ¹³⁶Xe with EXO-200

EXO-200 Collaboration: J.B. Albert , D.J. Auty , P.S. Barbeau , E. Beauchamp , D. Beck , V. Belov , C. Benitez-Medina , M. Breidenbach
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T. Brunner A. Burenkov G.F. Cao C. Chambers J. Chaves B. Cleveland M. Coon A. Craycraft T. Daniels M. Danilov S.J. Daugherty C.G. Davis J. Davis R. DeVoe S. Delaquis T. Didberidze A. Dolgolenko M.J. Dolinski M. Dunford W. Fairbank Jr. J. Farine W. Feldmeier P. Fierlinger D. Fudenberg G. Giroux R. Gornea K. Graham G. Gratta C. Hall S. Herrin M. Hughes M.J. Jewell X.S. Jiang A. Johnson T.N. Johnson S. Johnston A. Karelin L.J. Kaufman R. Killick T. Koffas S. Kravitz A. Kuchenkov K.S. Kumar D.S. Leonard F. Leonard C. Licciardi Y.H. Lin J. Ling R. MacLellan M.G. Marino B. Mong D. Moore R. Nelson A. Odian I. Ostrovskiy C. Ouellet A. Piepke A. Pocar C.Y. Prescott A. Rivas P.C. Rowson M.P. Rozo J.J. Russell A. Schubert D. Sinclair E. Smith V. Stekhanov M. Tarka T. Tolba D. Tosi R. Tsang K. Twelker P. Vogel J.-L. Vuilleumier A. Waite J. Walton T. Walton M. Weber L.J. Wen U. Wichoski L. Yang Y.-R. Yen O.Ya. Zeldovich
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classification ✦ hep-ex nucl-exphysics.ins-det
keywords cdotdecaysearchdouble-betaexo-200majoron-emittingmodesconstant
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EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe. Here we report on a search for various Majoron-emitting modes based on 100 kg$\cdot$yr exposure of $^{136}$Xe. A lower limit of $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. on the half-life of the spectral index = 1 Majoron decay was obtained, corresponding to a constraint on the Majoron-neutrino coupling constant of $|< g^{M}_{ee} >|<$ (0.8-1.7)$\cdot$10$^{-5}$.

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